// var float = '1.23';
// var num = parseFloat(float);
// console.log(num);

const num = -0.01;
const number = parseFloat(num);
if (isNaN(number)) {
  console.log(123);
} else {
  console.log(number);
}
const array = ['hello', 'world', 'you'];
let account = [];
account = account.concat(array[0]);
account = account.concat(array[1]);
account = account.concat(array[2]);
console.log('account:' + account);
